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The power or motivating source is attached to the feeder tray at a prescribed angle. (This angle may vary due to the physical characteristics of the product.) The entire feeder, being either suspended or on isolation mounts, is moved forward and upward and then moves backward to its original position. The material on the tray is lifted forward and upward. However, the material being lifted free does not return with the backward movement of the tray, but falls to a more forward position on the tray due to the slower action of gravity, where it is again lifted free by the next forward and upward stroke.
 
While in appearance the movement of the material is that of a uniform flowing stream, it is a series of continuous, rapid, short forward hops which are imperceptible to the eye.
Method of Computing Size and Capacity of Vibratory Feeders
The tons-per-hour capacity of The Cleveland Vibrator Company vibratory feeders is based on the flow of dry sand weighing one hundred pounds per cubic foot. To order a vibratory feeder of proper output capacity for your product, first determine yor required output in tons-per-hour (T.P.H.). Tis is done by weighing one cubic foot of your product. With this weight factor, then select its Cleveland Vibrator Company density factor from the conversion table.
Multilply yor T.P.H. requirement by the selected Cleveland Vibrator density factor, and the result is the catalogued T.P.H. capacity for the feeder you require.
Example: You desire to feed 30 T.P.H. of your product. Your product weights 60 pounds per cubic foot. (The Cleveland Vibrator Company density factor for 60 pounds per cubic foot is 1.7) Multiply T.P.H. desired by The Cleveland Vibrator Company density factor. 30 T.P.H. x 1.7 = 51 T.P.H. (The Cleveland Vibrator Company capacity rating.) You will therefore require a feeder that will deliver 51 T.P.H. or more. (i.e., a 50 T.P.H. Cleveland Vibrator Company rated feeder will deliver 29-1/2 T.P.H. of your product weighing 60 pounds per cubic foot.)
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Cleveland Vibrator Company